University of Saskatchewan professor Alex Moewes gives a talk titled "Soft X-ray Spectroscopy at the REIXS beamline to solve physics problems in new materials"
Talk outline
The outer electrons in matter govern nearly all properties of materials including bonding, structure, magnetism, heat-, electrical- and superconductivity, and optical properties to name a few. Synchrotron radiation allows to access these outer electrons and hence study of these parameters.
I will give an overview of our group’s soft X-ray spectroscopy at the endstation for inelastic scattering at the REIXS beamline at CLS. We use X-ray absorption (XAS), X- ray emission (XES), Resonant inelastic X-ray scattering (RIXS) and X-ray excited optical luminescence (XEOL) to probe the electronic structure of new materials. Our own density functional theory calculations model the measured spectra and allow to extract more detailed information from the systems studied.
The examples I will discuss span a wide range of materials and include low- dimensional materials like Carbyne, Graphene and Silicene, Eu-doped nitride semiconductors used in pc-LED lighting applications and transition metal-doped semiconductors for spinelectronic materials.
I will specifically address one aspect that is common to all the above systems, which is the role of defects in semiconductors.
About Alex Moewes
Alexander Moewes is a Professor in the Department of Physics and Engineering Physics and a Canada Research Chair at the University of Saskatchewan. He is also leading the inelastic scattering endstation of the REIXS beamline at the Canadian Light Source. He obtained his Ph.D. in Condensed Matter Physics 1995 at the University of Hamburg in Germany at HASYLAB/DESY. After working as a postdoctoral researcher at Tulane University and as an assistant professor at Louisiana State University, he joined the Dept. of Physics at the University of Saskatchewan in 2000. He has published over 270 peer reviewed scientific articles and guided over 35 graduate students. His research lies in Materials Science and Condensed Matter Physics using synchrotron-based soft X-ray spectroscopy techniques and density functional theory. His group currently is focusing on materials for spinelectronic applications, low dimensional systems, and semiconductors for pc-LED materials for lighting applications.